<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Login Form</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }
        .login-container {
            background-color: white;
            padding: 20px;
            border-radius: 5px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }
        .login-container h2 {
            text-align: center;
        }
        .form-group {
            margin-bottom: 15px;
        }
        .form-group label {
            display: block;
        }
        .form-group input {
            width: 100%;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
        }
        .form-group button {
            width: 100%;
            padding: 10px;
            border: none;
            background-color: #5cb85c;
            color: white;
            border-radius: 5px;
            cursor: pointer;
        }
        .form-group button:hover {
            background-color: #4cae4c;
        }
    </style>
</head>
<body>
<div class="login-container">
    <h2>已退出</h2>
</div>
</body>
</html>